"The Royal Veterinary College has determined that nearly 80% of modern Thoroughbred racehorses have Eclipse in their pedigree (other sources state 90%)"
First offspring early 1780's - which would not run until mid 1780's at the earliest - Eclipse, himself, did not run until 5 years of age ... Races over much, much, longer distances in those days.
Covered mares for many years thereafter - which gets you towards 1793, and the book carried foalings from before that date.
Eclipse didn't go to stud until late 1770's First offspring early 1780's - which would not run until mid 1780's at the earliest - Eclipse, himself, did not run until 5 years of age ... Races over much, much, longer distances in those days. Covered m
DARLEY ARABIAN b 1700 Aleppo ch 1711 Hobgoblin br 1724 Shakespeare ch 1745 Spark* 1743c Bulle Rock [Hunt's] br 1759 Young Bulle Rock b 1773 Pacolet [Hopper's] gr c1750 Almanzor ch 1713 Spinner gr 1727 Bartlet's Childers b 1716 Squirt ch 1732 Marske br 1750 ECLIPSE
DARLEY ARABIAN b 1700 Aleppo ch 1711 Hobgoblin br 1724 Shakespeare ch 1745 Spark* 1743c Bulle Rock [Hunt's] br 1759 Young Bulle Rock b 1773 Pacolet [Hopper's] gr c1750 Almanzor ch 1713 Spinner gr 1727 Bartlet's Childer